自动配料控制系统的研制

介绍了采用OMRONCPLC为主控机的自动配料控制系统 ,其可通过变频调速实现给料控制。该系统具有精度高、可行性好、抗干扰能力强等优点 ,有一定的推广价值。     

Extraction of S‐parameters from time domain reflectometry and transmission measurements using rational functions

The extraction of the broad band S‐parameter response from transient reflection and transmission measurements is discussed. The proposed method uses the generalized pencil‐of‐function method, recursive deconvolution, and calibration structures to obtain a response using rational functions. A low loss printed circuit board plane and a lossy thin film plane are characterized to capture the two‐port S‐parameters. The results are compared with network analyzer measurements. The effects of the measurement parameters such as the sampling interval, time window, and number of averages are shown. The effect of time jitter on the extracted frequency response is quantified through repeated measurements. © 2003 Wiley Periodicals, Inc. Int J RF and Microwave CAE 13: 74–85, 2003.     

基于Volterra泛函级数的非线性系统的鲁棒辨识

针对弱非线性系统的鲁棒建模问题, 基于Volterra泛函级数, 结合集员辨识理论, 提出了广义频率响应函数的鲁棒辨识方法, 形成了一套较完整的弱非线性系统的鲁棒建模方法, 仿真结果表明该方法是行之有效的.     

具有一般故障模型的系统完整性的频域研究

针对一般的故障模型, 从频域角度提出了系统对传感器失效、执行器失效及传感器和执行器同时失效具有完整性的充分条件; 在此基础上, 通过与标准H_∞控制问题建立等价关系, 给出了输出反馈可靠性控制器的设计方法.     

一种通用指纹考勤管理系统的开发

考勤是各企事业单位对员工上下班情况进行监督管理的一种常用方式，本文介绍了一种通过指纹录入进行考勤的管理系统，重点介绍了该系统在通用性方面所做的工作。     

使用小波变换实现数字水印

提出了非完备性鲁棒性数字水印典型算法中的行之有效的设计策略，利用小波变换良好的时频局部特性，提出了基于块的小波变换的数字图像水印嵌入方案。为了使嵌入图像的水印具有更高的安全性，把扩频通信的概念和方法引入数字水印系统中，采用了扩频理论中的伪随机序列进行处理。     

基于SnapCopy的高性能数据库备份恢复技术

由于种种原因，现有的数据库系统在备份功能上都有不同程序的局限性，会对库的表空间进行备份时的锁定，从而导致一定程度的写操作中断。文中在设计存储管理系统时，应用了一种叫做SnapShotFS的技术，并在此基础上实现集成了SnapCopy工具的磁盘存储系统，解决数据备份过程中的业务不间断问题。     

一种前处理匹配方法

在分形图像压缩中，图像被分割成序列块和主块，其中每一个序列块与其相似的主块要从主池(子图像集)中进行匹配选择。不过，这个较大的池中实际上只有一部分被利用在图像编码中。我们通过利用较强亮度变化的主块来缩减主池，从而导致了分形图像在编码时间方面的改善。     

Experience with a Hybrid Processor: K-Means Clustering

We discuss hardware/software co-processing on a hybrid processor for a compute- and data-intensive multispectral imaging algorithm, k-means clustering. The experiments are performed on two models of the Altera Excalibur board, the first using the soft IP core 32-bit NIOS 1.1 RISC processor, and the second with the hard IP core ARM processor. In our experiments, we compare performance of the sequential k-means algorithm with three different accelerated versions. We consider granularity and synchronization issues when mapping an algorithm to a hybrid processor. Our results show that speedup of 11.8X is achieved by migrating computation to the Excalibur ARM hardware/software as compared to software only on a Gigahertz Pentium III. Speedup on the Excalibur NIOS is limited by the communication cost of transferring data from external memory through the processor to the customized circuits. This limitation is overcome on the Excalibur ARM, in which dual-port memories, accessible to both the processor and configurable logic, have the biggest performance impact of all the techniques studied.